Aluminum degassing tablets are solid chemical compounds — primarily based on hexachloroethane — that are plunged into molten aluminum to remove dissolved hydrogen gas. They release chlorine or nitrogen gas bubbles that carry hydrogen to the surface, preventing porosity and improving casting quality. Saru Aikoh Chemicals manufactures a complete range of degassing tablets for aluminum foundries, die-casters, and alloy makers across India.
What Are Aluminum Degassing Tablets and Why Does Your Foundry Need Them?
Aluminum degassing tablets are one of the most critical consumables used in aluminum casting and foundry operations. When aluminum is melted, it readily absorbs hydrogen gas from moisture in the atmosphere, from raw materials, and from the furnace environment. This dissolved hydrogen, if not removed before casting, causes tiny voids — called porosity — inside the solidified metal. The result? Weak castings, rejection rates, and costly rework.
Degassing tablets solve this problem at the source. These compressed chemical tablets — also called degasser tablets or aluminium degasser tablets — are introduced directly into the molten metal. As they dissolve, they release fine gas bubbles that physically scrub hydrogen out of the melt. The hydrogen attaches to these rising bubbles and escapes at the surface, leaving behind clean, dense aluminum ready for casting.
Whether you operate a die-casting shop, a sand casting foundry, a gravity casting unit, or a secondary aluminum smelter, degassing tablets are a non-negotiable step to ensure casting quality. As one of the most trusted foundry chemicals manufacturers in India, Saru Aikoh Chemicals has engineered its degassing tablet range to meet the exact demands of Indian and global aluminum producers.
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Understanding the Degassing Process in Aluminum Casting
Degassing is the process of removing dissolved gases — primarily hydrogen — from molten aluminum or its alloys before the metal is poured into molds. Hydrogen is the only gas that dissolves significantly in liquid aluminum, and its solubility drops sharply as the metal solidifies. This sudden drop forces hydrogen out of solution, creating gas bubbles trapped as microscopic pores within the casting.
The consequences of inadequate degassing include:
- Porosity and micro-shrinkage — weakening mechanical properties
- Poor surface finish — blistering and rough texture after machining
- Rejected castings — failing pressure tests or X-ray inspection
- Reduced tensile strength and elongation in finished parts
- Increased scrap rates — higher production costs
Degassing treatments using degassing tablets for aluminium address all these issues by ensuring the melt is clean, gas-free, and ready to produce high-integrity castings. The treatment typically takes just 2–5 minutes and delivers measurable improvements in casting density and surface quality.
Degassing Tablets Composition: What’s Inside?
Understanding degassing tablets composition helps foundry operators select the right product and handle it safely. The primary active ingredient in most aluminum degassing tablets is hexachloroethane (C₂Cl₆), commonly abbreviated as HCE.
How Hexachloroethane Tablets Work
Hexachloroethane tablets react vigorously when introduced into molten aluminum. The reaction proceeds as follows:
Reaction: C₂Cl₆ + 2Al → 2AlCl₃ + 2C
The aluminum chloride (AlCl₃) formed is gaseous at molten aluminum temperatures. These gas bubbles rise through the melt, collecting dissolved hydrogen as they travel to the surface — effectively purging the melt of gases.
Modern degassing tablets may use one or more of the following active compounds depending on their formulation:
- Hexachloroethane (HCE) — the most widely used degassing agent; produces chlorine-based purging bubbles
- Nitrogen-releasing compounds — used in nitrogen-based degassers; safer fume profile
- Chemical flux salts — added for combined degassing and inclusion removal
- Grain refiners — some advanced tablets include titanium or boron compounds for simultaneous grain refinement
- Binders and fillers — compressed with the active ingredient for controlled release rate
Saru Aikoh’s Degasser NT range includes both chlorine-based and nitrogen-based formulations, allowing foundry operators to choose the product that best suits their environmental compliance requirements and performance needs. You can explore the full line of foundry fluxes and degassing products from Saru Aikoh Chemicals.
Complete Product Range: Saru Aikoh Aluminum Degassing Tablets
Saru Aikoh Chemicals manufactures one of India’s most comprehensive ranges of aluminium degasser tablets, covering everything from general-purpose degassing to specialized formulations for utensil makers, alloy manufacturers, and die-casters. All products work at melt temperatures of 640°C–750°C with an application rate of 0.1–0.3% by weight.
| Product Name | Tablet Size | Color | Application / Function | Temperature | Application Rate |
|---|---|---|---|---|---|
| Degasser D-6 | 50, 250, 500 gm | Black | Low fume, slow bubble degassing — ideal for reverberatory furnaces | 640°C–750°C | 0.1–0.3% |
| Degasser D-19 | 50, 250, 500 gm | Blue | Degassing cum grain refiner for aluminium & its alloys — dual action product | 640°C–750°C | 0.1–0.3% |
| Degasser D-20 | 50, 250, 500 gm | Violet | Standard degasser for aluminum and aluminum alloys — widely used | 640°C–750°C | 0.1–0.3% |
| Degasser D-50 | 50, 250, 500 gm | Blue | Super strong degasser for aluminum alloys — specifically for utensil & circle makers | 640°C–750°C | 0.1–0.3% |
| Degasser D-108 5 | 500 gm | Black | Low degassing for aluminium alloy — economical option for standard melts | 640°C–750°C | 0.1–0.3% |
| Degasser D-108 7 | 50, 250 gm | Violet | Degassing for aluminum melt — specially designed for alloy manufacturers | 640°C–750°C | 0.1–0.3% |
| Degasser D-108 N | 500 gm | White | Nitrogen-based degasser for aluminum and aluminum alloys — low fume, safer profile | 640°C–750°C | 0.1–0.3% |
| Degasser D-200 | 250, 500 gm | Black | Strong degassing for utensils and circle manufacturers — high performance | 640°C–750°C | 0.1–0.3% |
| Degasser D-210 | 500 gm | — | Strong degassing for utensils and circle manufacturers — enhanced formula | 640°C–750°C | 0.1–0.3% |
| Degasser D-230 | 500 gm | Violet | High-performance foundry tablet with chemical salts — effective gas removal from molten aluminium | 640°C–750°C | 0.1–0.3% |
TDS (Technical Data Sheets) and MSDS (Material Safety Data Sheets) are available on request for all Saru Aikoh degasser products. Contact the technical team to get the right specification sheet for your application.
Key Benefits of Using Aluminum Degassing Tablets
The right degassing treatment delivers measurable, immediate improvements across every stage of your casting process. Here is what foundry operators consistently report after switching to quality degassing tablets for aluminium:
Reduced Porosity
Eliminates hydrogen gas voids, producing denser, defect-free castings.
Better Mechanical Properties
Higher tensile strength, elongation, and hardness in finished parts.
Improved Surface Finish
Smoother casting surfaces reduce machining time and material loss.
Lower Rejection Rates
Fewer scrapped castings, lower rework costs, higher productivity.
Fast Treatment Time
Full degassing treatment completed in just 2–5 minutes per heat.
Low Fume Options
Nitrogen-based and low-fume grades available for cleaner operations.
Beyond these core benefits, consistent degassing also improves your pressure tightness for hydraulic and automotive parts, produces better results in X-ray inspection, and delivers more consistent mechanical test results batch after batch. For foundries looking at export quality or OEM supply, proper degassing is not optional — it is a quality certification requirement.
As highlighted in expert industry coverage on top foundry chemicals manufacturers in India, Saru Aikoh Chemicals has built its reputation on consistent product quality and technical support that helps foundries achieve lower rejection rates.
How to Use Degassing Tablets: Step-by-Step Guide
Proper application technique is just as important as product selection. Follow these steps to get maximum benefit from aluminum degassing tablets:
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Prepare the melt Ensure aluminum is fully molten and clean. Skim off major dross and oxides from the surface. Melt temperature should be between 640°C and 750°C.
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Calculate the dosage Use 0.1% to 0.3% of the melt weight. For example, for a 500 kg heat, use 500–1500 grams of degassing tablets. Adjust based on hydrogen level and alloy type.
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Use a plunging tool Place the tablet(s) in a perforated steel bell or plunging rod. Never add tablets directly from the top without plunging — surface reaction is inefficient.
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Plunge to the bottom of the melt Push the tablet to the bottom third of the molten bath and hold it there. Move slowly across the furnace floor to distribute the gas bubbles evenly.
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Allow full reaction The treatment typically lasts 2–5 minutes. You will see fine bubbles rising to the surface. Do not pour until bubbling has significantly reduced and the melt surface is calm.
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Skim the surface and pour After degassing, skim any remaining dross. The melt is now ready for casting. Pour as soon as possible after treatment to prevent re-absorption of hydrogen.
Safety Note: Always wear appropriate PPE — heat-resistant gloves, face shield, and protective clothing — when handling degassing tablets near molten metal. Ensure adequate ventilation in the furnace area. Request TDS and MSDS documents from Saru Aikoh Chemicals for complete safety handling instructions.
Degassing Tablets vs. Other Degassing Methods
Aluminum foundries have multiple options for degassing molten metal. Each method has its advantages and limitations. Here is how degassing tablets compare with alternative approaches:
| Method | Equipment Cost | Ease of Use | Effectiveness | Best For |
|---|---|---|---|---|
| Degassing Tablets (HCE/N₂) | Very Low | Very Easy | High | All furnace types, small–medium heats |
| Rotary Degassing (RDU) | High | Moderate | Very High | Large continuous production lines |
| Lance Degassing (N₂/Cl₂ gas) | Medium | Moderate | High | Medium–large foundries with gas supply |
| Vacuum Degassing | Very High | Complex | Very High | Aerospace-grade alloys |
| Flux Powder Degassing | Low | Easy | Medium | Combined fluxing & light degassing |
For most small to medium aluminum foundries, die-casters, and secondary smelters in India, degassing tablets remain the most practical and cost-effective choice. They require no capital investment in equipment, work with any existing furnace setup, and deliver consistent results with minimal operator training.
Choosing the Right Degassing Tablet for Your Application
With ten different degasser formulations available from Saru Aikoh, selecting the right product depends on your specific process requirements. Here is a practical guide:
- Reverberatory furnaces: Choose Degasser D-6 — its slow bubble, low fume design is optimized for the longer treatment times common in reverberatory setups.
- Grain refinement needed: Use Degasser D-19 — it combines degassing with grain refinement in a single treatment, saving time and chemical cost.
- General-purpose aluminum alloys: Degasser D-20 is a versatile, well-proven product for most standard aluminum casting alloys.
- Utensil and circle manufacturers: Degasser D-50 or D-200 offer the stronger degassing action needed for the high-purity aluminum used in cookware and circles.
- Alloy manufacturers: Degasser D-108 7 is engineered for the specific challenges of aluminum alloy production.
- Low-fume / environmental compliance: Degasser D-108 N uses a nitrogen-based system for a cleaner fume profile without compromising degassing efficiency.
- High-performance foundry use: Degasser D-230 is formulated with chemical salts for demanding foundry environments requiring thorough gas removal.
If you are unsure which grade suits your operation, the technical team at Saru Aikoh Chemicals will evaluate your alloy composition, furnace type, and casting requirements to recommend the ideal product. Explore the complete portfolio of foundry fluxes and treatment products to find a complete melt treatment solution for your foundry.
Degassing Tablets Price and Availability in India
Degassing tablets price in India varies based on formulation type, tablet size, order quantity, and specific grade. Chlorine-based hexachloroethane tablets and nitrogen-based grades are priced differently due to raw material costs. For accurate, up-to-date pricing on Saru Aikoh degassing tablets, buyers are encouraged to contact the sales team directly.
Key factors that influence degassing tablets price in India:
- Order quantity — bulk orders of 250 kg and above typically attract better pricing
- Tablet size — 50 gm packs are more economical per unit weight for small foundries; 500 gm tablets offer better economy for larger heats
- Grade and formulation — nitrogen-based grades (D-108 N) command a premium; standard HCE grades are more economical
- Packaging and delivery location — PAN India delivery available; freight costs may apply for remote locations
As leading degassing tablets manufacturers in India, Saru Aikoh Chemicals offers competitive pricing with consistent quality backed by technical support. Request a quote today through the contact page and get a response from the technical team within 24 hours.
Why Choose Saru Aikoh Chemicals for Aluminum Degassing Tablets?
Saru Aikoh Chemicals has built a strong reputation as one of India’s most reliable aluminium degasser tablets manufacturers in India. The company combines Japanese technical expertise with deep knowledge of the Indian foundry industry, offering products that are engineered for real-world performance.
- Wide product range — 10+ degassing formulations covering all aluminum casting applications
- Proven performance — used by foundries, die-casters, utensil manufacturers, and alloy makers across India
- Technical support — experienced team available to advise on product selection, dosage, and application technique
- Complete documentation — TDS and MSDS available on request for every product grade
- Reliable supply — consistent product quality with no batch-to-batch variation
- Custom solutions — ability to develop tailored formulations for specific alloy systems or process requirements
Whether you are a large aluminum die-casting manufacturer or a small foundry looking to reduce rejection rates, Saru Aikoh Chemicals has the product and the expertise to help you achieve consistent, high-quality castings. Browse the full range of foundry flux and treatment solutions and discover how a complete melt treatment program can transform your casting quality.
Frequently Asked Questions About Aluminum Degassing Tablets
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